Portable acoustic coupler

Details Portable acoustic coupler Portable acoustic coupler

1992-07-06

1993-11-23

Douglas, Alan P.

Recording, communication, or information retrieval equipment

Video or audio transmission, recording or playback equipment

Element or attachment

Patent

active

D03415945

REFERENCES:
patent: D208787 (1967-10-01), Bennstrom-Prescott
patent: D265992 (1982-08-01), Hirata et al.
patent: D272345 (1984-01-01), Kessler
patent: D281878 (1985-12-01), Kawakami
patent: D282256 (1986-01-01), Mizuno
patent: D299457 (1989-01-01), Behnk
patent: D333139 (1993-02-01), Poudore
patent: 3553374 (1971-01-01), Wolf et al.
patent: 4833700 (1989-05-01), Seaburg

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